Qtech-data-systems Wireless Point to Point (WP2P) - Digital & Ana Manual do Utilizador descarregar pdf (Página 6)

WirelessPointtoPoint-DIGITAL&ANALOGUE-QuickStartGuide–v1.1–June2013 6

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 www.qtech.co.nz Tel:033663713

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InternalFuse

TheWP2Pmodulecircuitisprotectedbya20mmx5mm500mAfastblowfuse.Thisis

locatedontheinternalcircuitboard.Toaccessthefuse,removethetopcoverbyprizingitoff

itsretainingdimples.Onlyreplacethefusewithanidenticaltype,donotusealternatives.

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RadioAddress(RA)

AllWP2Psystemshaveaunique“radioaddress”whichisprogrammedintoWP2Pmodules

duringmanufacture.

Theradiocodeisrepresentedandspecifiedinthefollowingformat“192.168.0.0”,itisa

securitymeasuretopreventunauthorisedusers.

Note–AllWP2Pmodulesinagivensystemmusthavethesamefirstthree

numbersintheir“radioaddress”andthe4

numbermustbeasequentialpairstarting

fromtheevennumbere.g0.1.1.40&0.1.1.41.ThecodeisontherearofWP2P

modules.TheradiocodemustbestatedforpurchasingforWP2Pmodulereplacement.

UsingMultipleWP2PSystemsinthesamearea

Therearetenindividualfrequencybandsreferredtoas“Channelnumbers”allowinguptoten

WP2Psystemstobeusedinthesamelocation.The“Channelnumber”isidentifiedbythe“#”

onthepackaginglabel;thisexampleis“Channel#1”.

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Warning–Donotusethesamechannelforadjacentsystems.Forexample,ifyou

currentlyuse“#1”ensuretheadjacentsystemis“#3”etc.

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Operationalnotes–Howdothemodulescommunicate?

TheWP2Pmodulesusean“eventdriven”approachtocommunications.Whenthestateof

anyinputchangestheWP2Pmodulewillimmediatelycommunicatethatchangetotheother

WP2Pmodule.Thisapproachresultsinveryfastresponsetimes.

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IfthecommunicationslinkbetweenapairofWP2Pmodulesgoesdown(forexampleifoneof

themlosespower),thentherelayoutputstateoftheonmoduleismaintainedatthevalueit

waspriortothelinkgoingdown.

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Inadditiontotheswitchinputstatechangemessageandthekeep-alivemessage,theWP2P

–DIGITAL&ANALOGUEmoduleswillsendamessagewhentheiranalogueinputvaluehas

changedbygreaterthan2.5%FSDsincethelasttimeitsentanymessage.(2.5%FSDis

0.5mAforacurrentloopconfiguredmodule).Thismeansthatforaveryfastchanging

analogueinputvalue,thecorrespondingoutputwillbealwayswithin2.5%oftheinputvalue.

Then,whenthemodulesendsakeep-alivemessageoraswitchchangemessage,the

currentanalogueinputvalueisalsosent,sotheoutputvaluewillbeequaltotheinputvalue.

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WhentheWP2Pmodulesdetectachangeoftheirinputstate,theywillimmediatelytransmita

messagetotheothermodule.ThereisaverysmallchancethatanotherWP2Pmoduleon

thatchannelalsowantedtosendamessageatexactlythesametime.Thiswillresultina

“collision”,buttheWP2Pmodulescandetectthatacollisionhasoccurred,andwillthenusea

collisionavoidanceschemetoretransmittheirmessages.

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Specificationsmaybesubjecttochange

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